/* 
 * Javascript to integrate Datables with Twitter Bootstrap
 * 
 */

/* Default class modification for Bootstrap */
jQuery.extend( jQuery.fn.dataTableExt.oStdClasses, {
	"sSortAsc": "header headerSortDown",
	"sSortDesc": "header headerSortUp",
	"sSortable": "header"
} );

/* API method to get paging information for Bootstrap */
jQuery.fn.dataTableExt.oApi.fnPagingInfo = function ( oSettings )
{
	return {
		"iStart":         oSettings._iDisplayStart,
		"iEnd":           oSettings.fnDisplayEnd(),
		"iLength":        oSettings._iDisplayLength,
		"iTotal":         oSettings.fnRecordsTotal(),
		"iFilteredTotal": oSettings.fnRecordsDisplay(),
		"iPage":          Math.ceil( oSettings._iDisplayStart / oSettings._iDisplayLength ),
		"iTotalPages":    Math.ceil( oSettings.fnRecordsDisplay() / oSettings._iDisplayLength )
	};
}

/* Bootstrap style pagination control */
jQuery.extend( jQuery.fn.dataTableExt.oPagination, {
	"bootstrap": {
		"fnInit": function( oSettings, nPaging, fnDraw ) {
			var oLang = oSettings.oLanguage.oPaginate;
			var fnClickHandler = function ( e ) {
				e.preventDefault();
				if ( oSettings.oApi._fnPageChange(oSettings, e.data.action) ) {
					fnDraw( oSettings );
				}
			};

			jQuery(nPaging).addClass('pagination').append(
				'<ul>'+
					'<li class="first disabled"><a href="#">&larr; '+oLang.sFirst+'</a></li>'+
					'<li class="prev disabled"><a href="#">&larr; '+oLang.sPrevious+'</a></li>'+
					'<li class="next disabled"><a href="#">'+oLang.sNext+' &rarr; </a></li>'+
					'<li class="last disabled"><a href="#">'+oLang.sLast+' &rarr; </a></li>'+
				'</ul>'
			);
			var els = jQuery('a', nPaging);
			jQuery(els[0]).bind( 'click.DT', { action: "first" }, fnClickHandler );
			jQuery(els[1]).bind( 'click.DT', { action: "previous" }, fnClickHandler );
			jQuery(els[2]).bind( 'click.DT', { action: "next" }, fnClickHandler );
			jQuery(els[3]).bind( 'click.DT', { action: "last" }, fnClickHandler );
		},

		"fnUpdate": function ( oSettings, fnDraw ) {
			var iListLength = 5;
			var oPaging = oSettings.oInstance.fnPagingInfo();
			var an = oSettings.aanFeatures.p;
			var i, j, sClass, iStart, iEnd, iHalf=Math.floor(iListLength/2);

			if ( oPaging.iTotalPages < iListLength) {
				iStart = 1;
				iEnd = oPaging.iTotalPages;
			} else if ( oPaging.iPage <= iHalf ) {
				iStart = 1;
				iEnd = iListLength;
			} else if ( oPaging.iPage >= (oPaging.iTotalPages-iHalf) ) {
				iStart = oPaging.iTotalPages - iListLength + 1;
				iEnd = oPaging.iTotalPages;
			} else {
				iStart = oPaging.iPage - iHalf + 1;
				iEnd = iStart + iListLength - 1;
			}

			for ( i=0, iLen=an.length ; i<iLen ; i++ ) {
				// Remove the middle elements
				jQuery('li', an[i]).filter(':not(.first)').filter(':not(.last)').filter(':not(.prev)').filter(':not(.next)').remove();

				var elm = jQuery(an[i]).find('.next');
				// Add the new list items and their event handlers
				for ( j=iStart ; j<=iEnd ; j++ ) {
					sClass = (j==oPaging.iPage+1) ? 'class="active"' : '';
					
					jQuery('<li '+sClass+'><a href="#">'+j+'</a></li>')
						.insertBefore(elm)
						.bind('click', function (e) {
							e.preventDefault();
							oSettings._iDisplayStart = (parseInt(jQuery('a', this).text(),10)-1) * oPaging.iLength;
							fnDraw( oSettings );
						} );
				}

				// Add / remove disabled classes from the static elements
				if ( oPaging.iPage === 0 ) {
					jQuery('li.first', an[i]).addClass('disabled');
					jQuery('li.prev', an[i]).addClass('disabled');
				} else {
					jQuery('li.first', an[i]).removeClass('disabled');
					jQuery('li.prev', an[i]).removeClass('disabled');
				}

				if ( oPaging.iPage === oPaging.iTotalPages-1 || oPaging.iTotalPages < 0 ) {
					jQuery('li.next', an[i]).addClass('disabled');
					jQuery('li.last', an[i]).addClass('disabled');
				} else {
					jQuery('li.next', an[i]).removeClass('disabled');
					jQuery('li.last', an[i]).removeClass('disabled');
				}
			}
		}
	}
	
} );